For a 120-volt supply, what will be the current if connected to a load of 30 ohms?

To find the current flowing through a circuit when voltage and resistance are known, Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R), can be applied. The formula is:

I = V / R

In this scenario, the voltage is 120 volts and the resistance is 30 ohms. Plugging in these values provides:

I = 120 volts / 30 ohms = 4 amperes.

This calculation shows that the current for a 120-volt supply connected to a load of 30 ohms is 4 amperes. Therefore, the correct choice is the one that specifies 4 amperes as the current.

Understanding this principle is essential for anyone working with electrical systems, as it allows one to determine the expected current through a circuit under specific conditions. This kind of electrical calculation is critical for the safe and effective design and troubleshooting of electrical circuitry in commercial kitchen equipment.